Connection Of The Cooling Pipes To The Machine; Washing Of Coolant Piping; Piping Length And Refrigerant Charge; Cooling Capacity Correction Factor Based On The Length Of The Refrigerant Piping - Mitsubishi Electric s-MEXT 006-044 Installations, Bedienungs Und Wartungsanleitungen

s-MEXT
•
always make large bends, with a minimum radius at least equal to the diameter of the
pipe.
•
always use a roller tube cutter to cut the pipes. Do not use a saw, as it causes internal
burrs and shavings.
•
fix the pipes both horizontally and vertically with copper or plastic collars every 2 m.
• do not use galvanized iron collars, since corrosion may occur at the point of contact
with the copper pipe.
• for insulated pipes, it is advisable to use collars with insulating shells.
•
keep a distance of at least 20 mm between piping.
• do not place electric cables nearby, as they may deteriorate.
•
make "expansion joints" on the line, to balance the natural elongation / shrinkage of
the pipes, as shown in the figure:
LIRA compensator
2.3.3

CONNECTION OF THE COOLING PIPES TO THE MACHINE

On the gas and liquid pipes inside the machine are cooling circuit ball taps with coupling
copper pipe stub.
OBLIGATION
DO NOT OPEN THE MACHINE COOLING CIRCUIT TAPS
Complete the joint as follows:
1. cut the end of the stub pipe using a roller tube cutter
– DO NOT USE A SAW AS IT WILL CAUSE BURRING
AND CHIPS
2. make a cup joint on the cooling piping and braze weld the
stub pipe
3. Open the machine taps and empty using the service ports
(Ø 5/16").
IF POSSIBLE, AVOID BRAZING ACTIVITIES INSIDE
THE MACHINE.
2.3.4

WASHING OF COOLANT PIPING

OBLIGATION
The oxide that forms inside the pipe during the brazing process is
dissolved by the HFC fluids and causes obstruction of the
refrigerant filter. During the brazing process it is advisable to
introduce nitrogen into the piping. If this is not possible, after
completing the brazing operation wash the piping using solvents.
2.3.5

PIPING LENGTH AND REFRIGERANT CHARGE

MODEL 006
SIZE F1
External unit no. 1
60
PUHZ-
Model
VHA
ZRP
2
Gas piping 5/8"
Ø inches
Liquid piping 3/8"
2.3.6 COOLING CAPACITY CORRECTION FACTOR BASED ON THE LENGTH OF
THE REFRIGERANT PIPING
Refrigerant piping length (one way)
Indoor and outdoor unit 5 m
006 F1 + PUZH-ZRP60 VHA2 1.00
009 F1 + PUZH-ZRP100 VKA3 1.00
013 F1 + PUHZ-ZRP125YKA3 1.00
022 F2 + PUHZ-ZRP250YKA3 1.00
038 F3 + 2xPUHZ-ZRP200YKA3 1.00
044 F2 + 2xPUHZ-ZRP250YKA3 1.00
Refrigerant piping length (one way)
Indoor and outdoor unit 55 m
006 F1 + PUZH-ZRP60 VHA2 X
009 F1 + PUZH-ZRP100 VKA3 0.876
013 F1 + PUHZ-ZRP125YKA3 0.845
022 F2 + PUHZ-ZRP250YKA3 0.876
038 F3 + 2xPUHZ-ZRP200YKA3 0.876
044 F2 + 2xPUHZ-ZRP250YKA3 0.876
X = NOT ALLOWED
UM_s-MEXT_01_Z_03_19_ML
OMEGA compensator
009 013 022 038 044
F1 F1 F2 F3 F3
1 1 1 2 2
100 125 250 200 250
VKA3 YKA3 YKA3 YKA3 YKA3
5/8" 5/8" 1" 1" 1"
3/8" 3/8" 1/2" 3/8" 1/2"
10 m 20 m 30 m 40 m 50 m
0.992 0.976 0.962 0.949 X
0.985 0.957 0.931 0.908 0.886
0.981 0.946 0.914 0.885 0.858
0.985 0.958 0.931 0.908 0.887
0.985 0.958 0.931 0.908 0.887
0.985 0.958 0.931 0.908 0.887
60 m 70 m 80 m 90 m 100 m
X X X X X
0.865 X X X X
0.834 0.812 X X X
0.865 0.847 0.829 0.815 0.800
0.865 0.847 0.829 0.815 0.800
0.865 0.847 0.829 0.815 0.800
2.3.7 ADDITIONAL REFRIGERANT CHARGE FOR STANDARD DIAMETER PIPING
BASED ON LENGTH
Indoor and outdoor unit
006 F1 + PUZH-ZRP60 VHA2
009 F1 + PUZH-ZRP100 VKA3
013 F1 + PUHZ-ZRP125YKA3
022 F2 + PUHZ-ZRP250YKA3
038 F3 + 2x PUHZ-ZRP200YKA3
044 F2 + 2x PUHZ-ZRP250YKA3
Indoor and outdoor unit
006 F1 + PUZH-ZRP60 VHA2
009 F1 + PUZH-ZRP100 VKA3
013 F1 + PUHZ-ZRP125YKA3
022 F2 + PUHZ-ZRP250YKA3
038 F3 + 2x PUHZ-ZRP200YKA3
044 F2 + 2x PUHZ-ZRP250YKA3
(*) from 71 to 100 m please refer to the Mr.Slim manual.
Notes; --- = NO ADDITIONAL CHARGE
PIPING SIZE TABLE
Nominal size (inches)
1/4"
3/8"
1/2"
5/8"
3/4"
1"
2.3.8

INSTALLATION DIAGRAM

LIQUID LINE
GAS LINE - Isolated
APPLY THE DIAGRAM TO EACH COOLING CIRCUIT OF THE MACHINE.
THE COOLING CIRCUIT DOES NOT NEED TRAPS OR OTHER PRECAUTIONS
TO GUARANTEE THE RETURN OF LUBRICANT OIL TO THE COMPRESSOR
21
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
English
5 m 10 m 20 m 30 m
--- --- --- 0.06
--- --- --- 0.06
--- --- --- ---
--- --- --- ---
--- --- --- ---
--- --- --- ---
41...50 m 51...60 m 61...70 m
X X X
0.06 0.06 X
0.06 0.06 0.06
0.12 0.12 0.12
2x 0.09 2x 0.09 2x 0.09
2x 0.12 2x 0.12 2x 0.12
X = NOT ALLOWED
External diameter (mm)
6.35
9.52
12.70
15.88
19.05
25.40
31...40 m
0.06
0.06
0.06
0.12
2x 0.09
2x 0.12
71...100 m
X
X
X
0.12 (*)
2x 0.09 (*)
2x 0.12(*)